[csswg-drafts] Pull Request: Siriwan17 patch 1

siriwan17 has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== Siriwan17 patch 1 ==
[css-spec-shortname-1] Brief description which should also include the #issuenum-or-URL and/or link to relevant CSSWG minutes.

Copy the above line into the Title and replace with the relevant details. Fill in any additional details here. See https://github.com/w3c/csswg-drafts/blob/master/CONTRIBUTING.md for more info.


See https://github.com/w3c/csswg-drafts/pull/4185